RFFM4251

Wi-Fi Front End Module

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Data Sheet 20161130 | Subject to change without notice

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Pin Configuration and Description

Top View

Pad No.

Label

Description

1

PDET

DC power detector. Provides an output voltage proportional to the RF output power level.

2

NC

No electrical connection. Recommend to connect to ground but it may be left floating.

3

VCC

4

VCC

5

TX

RF input. Internally matched to 50 Ω and DC blocked.

6

PA_EN

Input enable bias voltage (Regulated internally)

7

NC

No electrical connection. Recommend to connect to ground but it may be left floating.

8

RX

RF output from the low noise amplifier. Internally matched to 50

Ω and DC blocked.

9

LNA_EN

LNA control voltage.

10

VDD

Supply voltage for LNA and regulator

11

BT

RF bi-directional port. Internally matched to 50

Ω and DC blocked.

12

GND

Ground connection.

13

C_BT

Transmit-receive control voltage.

14

C_RX

Switch control voltage.

15

GND

Ground connection.

16

ANT

RF bi-directional antenna port. Internally matched to 50

Ω and DC blocked.

Backside Paddle

GND

RF/DC ground. Use recommended via pattern to minimize inductance and thermal resistance. See

PCB Mounting Pattern for suggested footprint.

16

15

14

13

PDET

NC

VCC

VCC

TX

PA_EN

NC

RX

LNA_EN

VCC

BT

NC

ANT

NC

C_RX

C_BT

9

10

11

12

4

3

2

1

5

6

7

8